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Wednesday, January 18, 2012

Cornstarch Suspension Science Experiment

What you need:

1 cup cornstarch
ABOUT 1/2 cup water
pie plate
food coloring
Optional: Cornstarch Suspension Printable Activity Sheet

Empty 1 cup of cornstarch into a large bowl.

Stir while you add water SLOWLY -- don't add all of it if you don't need to.
You need the consistency of thick pancake batter.
It's better to add too little water than too much.
Take your time!

Add a few drops of food coloring.

Stick your hands in the mixture.
Record what it feels like.
What happens when you try to roll some into a ball and then leave it alone?

Pour the water into a pie plate. (water is a liquid)
smack it with your hand
record what happens

Empty the pie plate. Pour the cornstarch mixture into a pie plate.
smack it with your hand
record what happens
does it act differently than the water?

What Happened:

When we talk about "states" of matter, we usually talk about the three types: solid (like a rock), liquid (like water) and gas (like the air we breath).

A mixture of cornstarch and water make what is known as a suspension. When you squeeze a Cornstarch Suspension it really feels like a solid because its molecules line up. But it looks like a liquid and acts like a liquid when no one is pressing on it because the molecules relax. This is another state of matter, called a suspension (It can act like a liquid, or, when pressed like a solid.).


  1. I have this on my list of things to do with kids this month! I did this when my daughter was little and I remember it being a lot of (messy) fun!


  2. It was so cool! I think I was more excited that the kids. I was amazed how when you held it tight it would stay in a ball form and as soon as you let go, it went back to liquid.